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I switched my ISP and got a new router/modem and a new contract which gives me currently up to 400Mbit of downstream. When I connect to a node e.g. Frankfurt or Dusseldorf which is nearby I experience a very slow connection (approx. 30 Mbit)

I'm not sure why this happens. I use the newest config file from github. I think I now use an IPv6 address instead of IPv4 (but i'm not sure if this has anything to do with the issue) and the router says it runs DSLite (i guess to map the internal IPv4 to an external IPv6?)

Tunnelblick has several setting options which also have to do with this topic like routing all IPv4 traffic and disable IPv6 etc.

Has anyone the same issue and is there a way to fix this? I read something about getting an IPv4 only mode from the ISP but since I'm not sure if this is even the issue I am pretty helpless.

Cryptostorm exit nodes don't support IPv6, so the fact that you are connecting to them at all tells us your router is being provisioned with an IPv4 address - you should be able to confirm this in the admin console of the router.

As for the speeds...the Frankfurt cluster is 100Mb/s which will likely be overloaded. The Dusseldorf cluster is 1Gb/s I think, but might not be. Can you try other nodes, e.g. FR, LT, LV, NL and see what you get? Some of our users can attest to much faster speeds, see here.

Thanks for your reply. I just wasn't sure if the IPv6 thing is an issue or not. But apparently it is not

For the speed I checked several nodes and got the following results:

NETHERLAND - down: 10 Mbit/s, up: 11 Mbit/s

DUSSELDORF - down: 18 Mbit/s, up: 20 Mbit/s

FRANKFURT - down: 57 Mbit/s, up: 21 Mbit/s

ENGLAND - down: 14 Mbit/s, up: 21 Mbit/s

DENMARK - down: 31 Mbit/s, up: 21 Mbit/s

FINLAND - down: 22 Mbit/s, up: 16 Mbit/s

LATVIA - down: 18 Mbit/s, up: 16 Mbit/s

PORTUGAL - down: 41 Mbit/s, up: 15 Mbit/s

FRANCE - down: 30 Mbit/s, up: 17 Mbit/s

ITALY - down: 41 Mbit/s, up: 20 Mbit/s

Could it be a config issue or is it possible that my ISP is doing some kind of braking down the speed? I do use cable and share my bandwidth with other people and some ISPs do this to maintain a stable bandwidth to all customers. But AFAIK Vodafone doesn't do that. They used to drop the speeds after 60GB/day but nowhere is anything said to cap VPN connections in general...

What's the spec of your Mac? Could it be that your hardware is too old for decent OpenVPN performance? What speeds do you get with no VPN active? Outside of that, I would think there's an issue between you and the exit node, and it's likely outside of your direct control.

An easy way to check would be to test drive (like 1 week) another (decent) VPN provider with exits in similar locations and see what you get. If your ISP is interfering with UDP/443 (or there's simply bad routing) you'll get similar results.

Thanks for your reply. I just wasn't sure if the IPv6 thing is an issue or not. But apparently it is not

For the speed I checked several nodes and got the following results:

NETHERLAND - down: 10 Mbit/s, up: 11 Mbit/s

DUSSELDORF - down: 18 Mbit/s, up: 20 Mbit/s

FRANKFURT - down: 57 Mbit/s, up: 21 Mbit/s

ENGLAND - down: 14 Mbit/s, up: 21 Mbit/s

DENMARK - down: 31 Mbit/s, up: 21 Mbit/s

FINLAND - down: 22 Mbit/s, up: 16 Mbit/s

LATVIA - down: 18 Mbit/s, up: 16 Mbit/s

PORTUGAL - down: 41 Mbit/s, up: 15 Mbit/s

FRANCE - down: 30 Mbit/s, up: 17 Mbit/s

ITALY - down: 41 Mbit/s, up: 20 Mbit/s

Could it be a config issue or is it possible that my ISP is doing some kind of braking down the speed? I do use cable and share my bandwidth with other people and some ISPs do this to maintain a stable bandwidth to all customers. But AFAIK Vodafone doesn't do that. They used to drop the speeds after 60GB/day but nowhere is anything said to cap VPN connections in general...

Is there a way to confirm e.g. that my ISP is doing this?

Somehow I'm not surprised.. because I've now had for ages this issue where I do wget speedtest my connection on VPN is capped to 1-2mb/s at the best or even slower depending on which node I connect NL,DK,LT,FI.. then I test torrent speeds which are completely fine I get my full speeds mostly or close enough 5-6mb/s download. Then I test browser download (bandcamp, mega.nz) I get full speeds or close enough. Next I test youtube buffering speed I'm again stuck at 1-2mb/s at google chrome.. I switch to choromium I suddenly get full speeds? and both browsers are synced with same settings and addons yet another gives better speed than other? I can't explain this.. so I decided to test same router with ethernet cable cat5e and laptop with ubuntu installed. I connect from terminal via openvpn I do wget speedtest again capped to 1-2mb/s? I can't think anything that would cause this issue? So here I am with arch linux and ubuntu systems being capped in different applications.. soon as I turn off VPN my speeds are fully working as they should be..

What's the spec of your Mac? Could it be that your hardware is too old for decent OpenVPN performance? What speeds do you get with no VPN active? Outside of that, I would think there's an issue between you and the exit node, and it's likely outside of your direct control.

An easy way to check would be to test drive (like 1 week) another (decent) VPN provider with exits in similar locations and see what you get. If your ISP is interfering with UDP/443 (or there's simply bad routing) you'll get similar results.

My Mac is from late 2009 (C2D 3.1Ghz, 12 GB RAM) running mac os sierra. Without OpenVPN I get between 90 and 180 Mbit/s depending on day and time of the day. The next thing I will test is to switch to TCP. After that I will check another VPN provider like you proposed.

Thanks for the reply. TCP will likely make things worse (or at least sub-optimal) but if it makes things better that would point to UDP traffic manipulation. I have an iMac 24" from early 2009 (C2D 2.66GHz, 4GB RAM), running El Capitan 10.11.6. Unfortunately, my connection is 8Mb/1Mb so I'll never see your issues in daily use.